Type-writing machine.



No. 877,241. PATENTED JAN. 21, 1908. G. H. SHEPARD. TYPE WRITING MACHINE.

APPLICATION FILED MAR,11,1901.

2 SHBETfi-SHEET 1.

WITNESSES;

INVENTDR: ff J HIE: TTEIRNEY No. 877,241. PATENTED JAN. 21, 1908.

v O. H. SHEPARD. TYPE WRITING MACHINE.

N PI 1) 11v APPLIOATIO LE MAR 1901 2 SHEETS SHEET 2.

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TTGRNEY UNITED STATES PATENT OFFiCFE.

CHARLES H. SHEPARD, OF NEW YORK, N. Y., ASSIGNOR TO WYOKOFF, SEAMANS dc BENEDi'CT, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed March 11, 1901. Serial No. 50,656-

To all whom it may concern:

Be it known that I, CHARLES H. SHEPARD, citizen of the United States, and resident of borough of Brooklyn, in the city of New York, in the county of Kings and State of New York, have invented certain new and useful Improvements in Type-Writing Machines, of which the following is a specification.

This invention relates to carriage escapement mechanisms of typewriting machines. The principal object of my invention is to secure a prompt advance movement of the carriage after each type impression is made.

The invention consists in certain combin-ations of devices, features of construction and arrangements of parts, all as will be hereinafter set forth and particularly pointed out in the concluding claims.

In the accompanying drawings, Figure 1 is a rear sectional elevation of a Remington N0. 6 typewriting machine, showing my improvements applied thereto. Figs. 2, 3 and 4 are respectively rear, front and edge views, enlarged, of an improved escapement wheel. Fig. 5 is a perspective fragmentary view of the escapement wheel. Fig. 6 is a diagrammatic plan, showing both a cross section of an escapement wheel tooth, and a topedge view of the escape-ment dogs, the latter being in normal position. Fig. 7 is a view similar to Fig. 6, but showing in full lines the positions assumed by' the dogs at the depression of a key. Fig. 8 is a view similar to Fig.6, but showing the positions of the parts at a point in the return movement of, the dog rocker. Fig. 9 is an enlarged perspective view .of an 'upper fragment of the dog rocker and a tooth of the escapement wheel. Fig. 10 is a fragmentary perspectiveview, and Fig. 11 is a fragmentary front view, showing how a uicker advance movement of the carriage t an usual heretofore, is secured.

In the several views, similar parts are designated by similar numerals of reference.

1. designates a longitudinally traveling carriage, which is propelled by a spring barrel 2 and strap 3, and carries a platen 4. U on the carriage is mounted a rack 5, w ich meshes with a pinion 6, the latter being connected to an escapement wheel or curved rack '7, ,whose movements are controlled b dogs mounted upon the up er end of a rocker 8. Said rocker is pivoted at beneath a series of levers 15, which are operated by keys 16.' These levers also operate the usual type bars (not shown). The dog rocker is provided with an adjustable returning spring 17. So far as specifically described, these devices are in common use in the Remington N o. 6 typewriting machine. .My improvements relate particularly to the construction and arrangement of the teeth of the'escapement wheel and of the dogs which 006 erate therewith.

Heretofore it has con common to form the teeth of the escapement with plain working faces, such that a cross-section of a tooth would have the form of a rectangle, while the tips of the teeth have been square, so that the working face of each tooth, considered as a whole, has been substantially rectangular in outline. that such teeth 'do not permit a sufficiently prompt advance movement of the carriage, and hence during rapid work there is con- 'stant liability of afailure of the carriage, after receiving one type impression, to com- :plete its letter space movement by the, time the next impression is made, so that the written characters are frequently irregularly spaced and sometimes overlap. In order to overcome this objection, I form upon each wheel tooth an oblique working face 18,

In practice it has been found which is produced by cutting away the rear 7 .corner of the tooth, or in other words, by

bevelin the usual working face of the tooth. A smal portion 19 of the usual face and which extends at right angles or substan tially right an les to the plane of the rack orescapement w eel is preferably retained for cooperation with the ordinary feeding dog, which is designated as 20. In other words, the plain or flat working face 19 of each toothextends at an angle to the working face 18 thereof and is of sufiicientwidth to prevent the feeding dog from being cut by the wheel tooth, thus insuring a free action of the do during its disengaging movements. Sai

feeding dog 20 is pivoted at 21 on the upper portion of the rocker 8, and is provided with the usual spring 22, which tends to move said dog towards the left, (viewed from the no front of the machine) so that, after escaping from the wheel tooth, said dog may spring past the same and take a position opposite the next notch in the wheel, as usual.

In rear of the normallyengaged feeding dog 20, I fix upon the rocker, by means of a screw 23, a normally disengaged detent dog 24, whose working face is preferably substantially parallel -with the beveled working face 18 of the engaged escapement wheel tooth when the parts are in the normal position (Fig. 6) and preferably at an angle of about thirty degrees to the working face of. the feeding dog 20. The forward vertical edge of the dog 24 is preferably separated from the rear vertical edge of the dog 20 by a gap whose width is about one-third of the thickness of the wheel tooth. The forward vertical edge ofthe detent dog is preferably directly in'rear of the rear vertical edge of the feeding dog, so that the working face of the detent dog forms practically a continuation of the working face of the feeding dog. It will be seen that the entire do 24 is placed obliquely upon the dog. rocker, ut it Will be understood that this is not essential, since only the actual working face of the dog needs to have an angular position.

In operation, when a key lever 15 is de-, pressed for the purpose of impressim its associated type upon the paper carried by the platen, the universal bar 14 is'forced down, and by means of the hooks 13 pulls down the crossbar 12 and vibrates-the-rocker 8 forwardly so that the feeding dog 20 is moved transversely of the wheel andisienabled to escape from the Wheel tooth, as indicated in dotted lines at Fig. 7, whereupon said do is vibrated by its spring 22 past the enga ed wheel tooth, to the position shown at ull lines in said figure and in'Fig. 9. At the same time the obliquedo 24 is carried forwardly by the rocker. At t e instant when the step-= ping dog 20 escapes from the wheel tooth,- the detent do 24 contacts with the beveled face 18 thereo so that the latter is not permitted to advance under the pull of the car-. riage spring 2. Upon the return mov,ement of the key lever and dog rocker, the dog-20' enters the next notch in the wheel, while the dog 24 is withdrawn, thereby releasing the wheel and permittin the latter to be rotated by reason of the pu of the carriage driving sprin 2. During this movement of the whee the succeeding tooth thereon is brought against the dog 20, and, overcoming the tension of the sprin 22, moves said dog in the plane of the whee back to its normal position against the upper end of the rocker 8, thus arresting the wheel and the carriage. i It will-be seen that by reason of the anguiar or oblique arrangement of the face 18 of the wheel tooth, a slight advance movement thereof is permitted during the entire withdrawing movement of the oblique detent 24,

-1to'oth as shown m Fig; 10. v

so great as re as indicated diagrammatically: at Fig. Thus the advance movement of the carriage and the return stroke of the dog rocker begin;

simultaneously, which isra feature of great importance, as the spacing movement of the carriage-1's completed sooner than in prior constructions where the carriage was held stationary during ajconsiderable portion of the return movement of the'dog rocker; and as a result'of this improvement, the spacing and would to an undue eXtentblock the movement of the wheel. But by cutting away or beveling said tip, as described, a greater BXtGlltfOfl'OfifidllOIl of the wheel is permitted during the withdrawal of the detent 'dog, and. before the disengagement thereof,

than would be permitted if said tip were not beveled. This will be understood by reference to Figs. 5', 9 Miami ll- In the last named figure, the Wheel tooth is shown in full lines as having swung slightly from its normal vertical position during the-retraction of the dog rocker, and in dotted lines at a later period, or at the moment when the tooth is released by the detent- 24. It will be perceived that at the releasing moment the body of the tooth considerably v-ov erla s the forward vertical edge of the detent og 24', and

:it will be understood that the forward corner or side edge-of-thedetent is. atj this-mement engaging the beveled tip 25 u" on the wheel I ,lfli 'willalso be understood that if itiwerenotfor the bevel 25, the movement" of. the wheel 1 during" the withdrawal of 'theideten't dog, would not be resented Tattdotted lines at Fig.- 1.1,;but that the wheel toothwould now stand at a. position about midway-between the full line and dotted line t positionsfat said figure."

Hence by theprovisioniof the'beveled working edge 25,* a,greater advance movement of the carriagegisjsecjured before-the final release of the-Wheel, which is-jan important advantage. Thus-'itiwill beseen that by the provision of the bevel 18 upon the'wheel tooth and of theoblique working face of the detent dog 24, 'l' am enabled. to secure a prompt ad- [Vance movement of the carriage, which beinsslmultaneousliyl with the upstroke of the ey; and'that by t e further provision of the beveled tip 25 u on the tooth, I am enabled to increase the ead of the carriage during the early part of the return movement of the key. Thus the movement of the carriage is completed promptly, and the liability of over appin .of type impressions is avoided. Further, t e promptness of the carriage movement is not dependent to such a great extent as heretofore upon the tension of the dog-returning spring 17, and hence the latter may beso adjusted as to afford a light tension without jeopardizing the action of the mechanism, and thereby the key resistance may be much reduced, rendering the machine easier to operate.

Various changes may be made within the scope of the invention. Obviously my improvements may be applied to straight escapement racks.

What I claim as new and desire tosecure by Letters Patent, is 2- 1. In a typewriting machine, the combination of a power driven carriage; an escapement i-nechainsm therefor, said escapement mechanism comprising a rack each tooth of which has a single working face at substantially right angles to the plane of the rack and a second working face oblique to said first mentioned workin -face, a loose dog and a fixed dog arranger side by side, one of said dogs having a single work rngface corre-f spending to andcooperating only with the right-angle face on each tooth of the rack and the other" dog having an oblique face matching and cooperating only with the oblique working face on each rack tooth,\the

loose do bein pivoted to move inthe direc.

tion of riioveni ent of the rack.

2.: In a typewriting machine, the combination of a power-driven carriage; and escapement mechanism therefor, said es'capement mechanism comprising an escapement wheel each tooth of which has a single working face at substantially right-angles to the plane of the wheel and a second working face oblique to the first mentioned working face, a loose dog and a fixed dog,-the loo'se Tdog havinga single working face corresponding to and co operating only with the right-angle ace on each tooth of the escapement wheel andthe fixed dog having an oblique face matching and cooperating only with the oblique working face on each tooth of' the escapement wheel, the loose dog being pivoted to move in the direction of movement of theescapement wheel;

3. In a typewriting machine, the combination with a power-driven carriage, of an es ca ement rack, each of w lase teeth is provi ed with two-working fie-es l8 and 19 that extend at an angle to each other, and two ke -o erated transversel movin do one Y y g of sai dogs normallyengaging on y said face 19 and hemg pivoted to vibrate in the same general direction as the escapei'nent rack and the working face of the other dog being substantially parallel to a face 18 of 'a rack tooth. 1

4. In a typewriting machine, the combina sition being adjacent to and practicallyforming a continuation of the right-angle working face of the normally'engaged dog; a

5. In a typewriting machine, the combination with a power-driven carriage, of an es-. capement rack, a-transversely movable dog normally engaging said rack and movable for a limited. distance therewith and having. a working face ,that extendsat right-angles to the plane of the said rack, and a detent dog normally disen aged from the rack and having a working face which extends obliquely from the working face of said normally engaged dog and forms a practical continuation thereof. I 61 In a typewritin'g machine, the combination of a power-driven carriage, an escapement whcel, a beveled working tip 25 formed upon eachtooth of the. escapement wheel, and key operated dogs coo crating with said wheel, one of said do s aving a'beveled Working face with whic said beveled work;-

pcooperates, v p

p n a typewriting machine, the combination of'a power-driven carria' e, an escapement wheel, a beveled wor face 18 formed upon each tooth thereof, a' beveled working tip 25;also formed upon each tooth,

ing ti 7.

a feeding dog 20, and an oblique detent dog 24. q

8. In a typewriting machine, thecombination of a power-driven carriage, an escapement wheel, a beveled face 18 formed'u on each tooth of the esca ement wheel, a ey operated dog rocker, a ceding dog 20 and an o lique dog 24 thereon, and-a beveled tip'25 formed upon each escapement wheel tooth for cooperation-With.a side edge of the dctent dog,

9. In a typewriting machine, the combination. of a power-driven carriage, an escape;

ment wheel, each tooth whereof has a beveled working face 18, a working face 19 at right-angles to .the plane of the escapement wheel and a beveled working tip 25, and keg- 12o controlled: do s cooperating .with said wor ing faces: and. eveledworkmg tips.

10. In a typewriting'machine; the combination of a power-driven carria "e; an ecsapement mechanism 'iherefor, sai escapement 125 mechanism comprising a rack, each'tooth of which has a single worldng face at substanr' tiall right angles to the plane of the rack, a

sing e working face-obli ueto the first mentioned worki'ng'face an. a beveled working 130 tip, a loose dog and a fixed dog one having a single working face corresponding to and 00- operating with the right-angle'face on each tooth ofthe rack and the'other (log having an oblique face matching and cooperating with the oblique working face and the beveled working tip on each racktooth, the

loose dog being pivoted to move in the plane of the rack.

11. In a typewriting machine, the coinbination of a power-driven'carria e, an escapement mechanism therefor, sairl escapement mechanism comprising an escapeinent wheel each tooth of which has a single working'face at substantially right angles to the plane of the escapement wheel, a single working face oblique to the first mentioned. working face and a beveled working tip, a loose (log and a working tip on each toothof the escapement' wheel, the loose dog being pivoted to move I in the plane of the esca ement wheel.

Signed at the boroug 'ofManhattan, in the -city of New .York, in the county of New York, and State of New .York, this ninth' day" of March; D. 1901. CHARLES H. SHEPARD.

Witnesses:

K. V. DONOVAN, E. M. WELLS. 

